Sand-sifter.



SAND SIFTER.

(Application led Dec. 21, 1899.7'

,lo l I uw A il m 1| No. 700,75l. Patented May 27, |902.`

U. EBERHARDT.

SAND SIFTEB. (Application'led Dec. 21, 1899.; (No Model.) 2 Sheets-Shee 2.

y l I F- I figg. i E Eg l G W a H -H-l UNITED STATESv PATENT OFFICE.'

ULRICH EBERHARDT, OF NEWARK, NEV JERSEY.

SAND-SIFTER.

SPECIFICATION forming part of Letters Patent No. 700,751, dated May 27, 1902.

Application filed December 21, 1899. Serial No. 741,128. (No model.)

T0 cir/ whom. t may concern.:

Be it known that I, ULRICH EBERHARDT, a citizen of the United States, of 95 New Jersey Railroad avenue, Newark, county of Essex, State of New Jersey, have invented certain new and useful Improvements in Sand-Sifters, fully described and represented in the following specification and the accompanying drawings, forming a part of the same.

The present invention relates to sundry improvements in the rotary sifters which are commonly used for sifting sand; and the improvements relate particularly to the class of power-riddle shown in my Patent No. 626,019, granted May 30, 1899, in which the sifter is overhung at the side of the frame and the machine provided with a flexible knocker to beat intermittingly upon the sides of the screen.

The present invention includes an adjustable connection between the knocker-arm and its pivoted shank to vary the location of the blows upon 'the screen, and thus avoid excessive wear upon the perforated material which sifts the sand. v v

In the present invention I furnish a single pulley to drive the rotary shaft and connect it with the shaft by a clutch, which is thrown into operation by a leveroscillated upon the shaft and accessible from either side of the frame. In such rotary sifter the sand is introduced through a central aperture or filling-hole upon the outer head of the screen, and the improvements embrace a flat concentric lip upon the top of a flange surrounding such aperture to prevent the material in the screen from falling out.

These improvements are set forth in the following descriptiomand particularly pointed out in the claims, reference being made to the annexed drawings, in which- Figure l is a side elevation of the apparatus provided with two screens at opposite sides of the frame, the right-hand screen being broken away to show the section of the filling-aperture. Fig. 2 is a plan of the clutchshifting lever; Fig. 3, an elevation of thedriving-pulley and clutch-shifting lever with the supporting-stand in the rear of the same, and Fig. 4: a perspective View of the shank for the knocker-arm. vFig. 5 is an enlarged section of the flange H detached from the screen.

The drawings show a means for mounting two, screens upon a single frame at opposite ends of the shaft and actuating them by a single pulley and clutch, the pulley being engaged with the clutch by a double-armed lever.

A designates the frame of the machine, upon which two stanchions B are mounted and provided with bearings C for the screen-shaft D. The ends of the shaft project outside the bearings, and each screen has an inner head H, secured to the shaft, and an outer head H', havinga central aperture I to throw in the sand or loam. The heads are connected by ties I' and are shown of hexagonalform, with wirecloth J secured upon the edges of the heads. Each knocker is formed with a shank K, pivoted by bolt B' upon one of the stanchions,with such bolt transverse to the line of the shaft D, and such shank is formed with a downwardlyprojecting arm Zt and roll Z to bear upon cam 4projections h upon the'head H of the screen,

as in my former patent. A spring b presses the arm normally toward the screen-head H. In the said patent the flexible knocker-arm was attached rigidly to the shank; but in the present invention the'knocker-arm N is attached to a stub endL and the shank is provided with a circular corrugated seat K in the plane of the pivot B', and the stub end is also corrugated and pivoted upon such seat by bolt fm. The disposition of the bolt B transverse to the shaft D causes the knockerarm to vibrate directly to and from the center of the screen, while the arrangement of .the seat K upon the shank K permits the adjustment of the knocker-arm laterally at right angles to its vibratory movement, so as to vary the location of the blows upon the screen and avoid excessive wear upon its perforated material. The filling-aperture I in the head H differs from that in my former patent in having a flat annular lip 'i upon the flange h', surrounding the aperture. The flange h has heretofore been made cylindrical at times, more commonlyof conical shape and flared inwardly, as shownin Fig. 5, to prevent sand from lodging upon the flange when thrown into the aperture and to prevent the sliding of the sand outwardly when accumulated within the screen. It has been found, however, that in practice more sand IOO escapes through the aperture from the upper part of the screen than overflows from. the lower part as the lumps break, which fall in confusion from the upper part of the screen upon the fiange, and the knocker throws the sand in some degree against the flange,`from which it sometimes glances outwardly. A conical or cylindrical flange alone is not therefore wholly efficient to retain the sand in the screen, especially if the screen be fed too fast. The fiat annular lip t, attached to the outer end -of the flange in the present invention, positively prevents the sand from sliding outwardly over the iiange, and thus enables the operator to use less care in supplying the screen with sand. The difference is very material in this case between the sloping or cylindrical flange heretofore used and the fiat lip which stands at right angles to the axis of the screen, as the flange has only a slight tendency to restrain the passage of the sand, while the fiat lip positively obstructs the same, whether it slides outwardly from the lower part of the screen or is thrown from the upper part of the same upon the iiange. The conjunction of the conical flange and fiat lip thus performs a double function, as the conical surface of the flange tends to move any sand inwardly which rests upon the flange, while the lip prevents any outer movement of the sand upon the flange beyond a certain limit, where it is positively arrested. The driving-pulley E is fitted loosely to the shaft between the bearings C, and the clutch F is secured to the shaft adjacent to one of the bearings, and the opposed faces of the clutch and pulley-hub are provided with teeth to engage one another. The double-armed lever G has an eye g fitted loosely to the shaft in contact with the pulley and provided with beveled lug e, projected toward the adjacent bearing. rlhe bearing is formed with a deep notch a, adapted to admit the beveled lug when the lever is in a central position, and with shallow lateral notches b, adapted to engage the point of the beveled lug when the eye is rotated by pushing either arm of the lever G. A spring @inserted between the pulley-hub and the clutch F, forces the pulley and the eye of the lever G normally toward the notched bearing. The lug e is doubly beveled, with similar inclination upon the opposite sides,and the downward pressure upon either arm of the lever G serves to draw the lug out of the notch and to press the pulley toward the clutch to engage the same. Then the eye gis thus rotated, the point of the beveled lug engages one of the shallow notches b, and is thus held from accidental displacement, which operates to retain the pulley engaged with the clutch as long as desired. The pulley is unclutched by shifting thelever to its central position. The two arms of lever G enable an operator at either side of the machine to rotate the eye g, and thus engage the pulley with the clutch or release it therefrom, while the two notches ZJ serve to engage the point of' the beveled lug whenA the eye is rotated toward either side of the machine by the downward movement of the lever-arm, which projects at that side.. Stanchions B are shown projected outwardly from the center of the shaft D beyond the periphery of the screen to receive the pivot of the knockerarm, and the pivot, as stated above, is so arranged that the knocker-arm may be vibrated to and from the periphery of the screen, While the knocker-arm itself is adjustable laterally at various angles to its pivotal support, so as to vary the location of the blows upon the screen.

The attachments above described render the machine more convenient to use and more durable in operation.

I am aware that the conical annular iiange has been used alone, as is shown in my prior patent, No. 626,019, of May 30, 1899, and that a fiat concentric lip has also been used upon a cylindrical fiange at the mouth of a screen in other prior constructions. The conical lip does not form a positive barrier to the escape of the material when it accumulates within the screen to the level of the aperture, and when the Hat lip is associated with the interior concentric flange such ange accumulates the drippings of the sand, (which are frequently moist enough to adhere thereto,) and they fill up the corner between the iiange and lip, so as to produce an inclined surface, like that of the conical lip, and thus destroy the efficiency of the at lip by producing a sloping surface upon the inner side of the same, which is equivalent to the conical lip. By

IOO

mounting my fiat lip 1I upon the conical flange f the moist material is prevented from adhering to the flange by reason of its sloping surface, and the flat lip thus projects as a positive barrier in the path of the material in its movement toward the aperture of the screen.

Having thus set forth the nature of the invention, what is claimed herein is'- l. In a sand-sitter having the frame with screen overhung at the side, an upwardly-projecting stanchion having a knocker pivoted thereon, and means for vibrating the knocker toward the periphery of the screen, the combination, with the shank of the knocker pivoted on the stanchion, of a knocker arm jointed to such shank substantially in the plane of such pivot in such manner as to permit variations of the location of the blow delivered by the arm substantially as herein set forth.

2. In a sand-sitter having the frame with bearings and shaft extended across the same with screens overhung at both ends and knock ers actuated by the screens to beat their peripheries, the combination, with the shaft, of a clutch secured thereto, a pulley fitted loosely to the shaft, and means for engaging the pulley with the clutch whereby a continuously-running belt upon a single pulley operates the two screens at pleasure simultaneously.

3. In a sand-sifter, the combination, with a frame having bearings, and a shaft extended across the same and a screen overhung at the side of the frame, of a stanchion projected outwardly from the bearing with knockerarm pivoted thereon to vibrate to and from the periphery of the screen, and the knockerarm being adjustable laterally at various angles from its pivotal point, to vary the location of the blow upon the screen.

4. In a sand-sifter having the frame with bearings and shaft extended across the same with screens overhung at both ends and knockers actuated by the screens to beat their peripheries, the combination, with the shaft, of a clutch F secured thereto next one ofthe bearings, and the opposite bearing having the witnesses.

ULRICH EBERHARDT. Witnesses:

FREDERICK L. EBERHARDT,A THOMAS S. CRANE. 

